chore: import upstream snapshot with attribution

2026-07-13 12:36:30 +08:00
commit 55ab4e4a73
473 changed files with 72932 additions and 0 deletions
@@ -0,0 +1,42 @@
+#include "../common/common.h"
+
+class Segment_tree_zkw {
+    private:
+        int tn;
+        int size;
+    public:
+        std::vector<int> t;
+        std::vector<int> num;
+        Segment_tree_zkw(int N){
+            size = (N+1)<<2;
+            this->t = std::vector<int>(size+1 , INT_MAX);
+            this->num = std::vector<int>(size+1 , 0);
+        }
+        void init(int N) {
+            for(int i = 0; i < size; i++){
+                this->t[i] = INT_MAX;
+                this->num[i] = 0;
+            }
+            
+            tn = 1;
+            while(tn < N) tn <<= 1;
+            --tn;
+            for (int i = 1; i <= N; ++i)
+                this->num[i + tn] = i;
+        }
+
+        void change(int p, const int &k) {
+            p += tn; this->t[p] = k; p >>= 1;
+            while (p) {
+                if (this->t[p<<1] < this->t[p<<1|1]) {
+                    this->t[p] = this->t[p<<1];
+                    this->num[p] = this->num[p<<1];
+                }
+                else {
+                    this->t[p] = this->t[p<<1|1];
+                    this->num[p] = this->num[p<<1|1];
+                }
+                p >>= 1;
+            }
+        }
+};